Complimentary Polytopic Interactions

Arikainen, Ekaterina O.; Boden, N.; Bushby, Richard J.; Lozman, Owen R.; Vinter, Jeremy G.; Wood, Andrew

doi:10.1002/1521-3773(20000703)39:13<2333::aid-anie2333>3.0.co;2-v

Cited by 112 publications

(75 citation statements)

References 10 publications

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“…The Col h mesophase range of HAT6 1b is 70-100 C [1] and that of a 50:50 mixture of HAT6 1b and PTP9 3a from below room temperature to 154 C [11]. The phase diagram is shown in .…”

Section: Resultsmentioning

confidence: 99%

“…It is readily sheared, aligns in a homeotropic manner between glass slides when annealed, and giving TOF photoconduction transit indicative of an absence of deep trap grain boundaries [14]. When HAT6 is mixed with PTP9 in heptane there is no change in colour and no charge transfer band is observed in the UV=visible spectrum [11]. The measured energy difference between first 348=[1390] N. Boden et al…”

Section: Resultsmentioning

confidence: 99%

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A Comparison of CPI and Charge-transfer Two-component Columnar Phases

Boden

Bushby

Lozman

2004

Molecular Crystals and Liquid Crystals

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The phase diagram for the binary mixture of 2,3,6,7,10,11-hexakis (4 0 -nonylphenyl) triphenylene and 2,3,6,7,10,11-hexakis(hexyloxytriphenylene) shows formation of a 1:1 compound with a higher clearing temperature and a greater mesophase range than either of the individual components. This and related CPI (Complementary Polytopic Interaction) compounds are compared to 'charge transfer compounds' formed on adding 2,4,7-trinitrofluoen-9-one (or one of its derivatives) to a 2,3,6,7,10,11-hexaalkyloxytriphenylene (or other discogen). There are significant differences between the actual phases formed but in terms of the local molecular packing and in terms of the stabilising interactions involved they are essentially the same. Both can be rationalised using the XED (extended electron distribution) model. In this it is assumed that dispersed coulombic and van der Waals interactions dominate and that other contributions are small.

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“…The Col h mesophase range of HAT6 1b is 70-100 C [1] and that of a 50:50 mixture of HAT6 1b and PTP9 3a from below room temperature to 154 C [11]. The phase diagram is shown in .…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

A Comparison of CPI and Charge-transfer Two-component Columnar Phases

Boden

Bushby

Lozman

2004

Molecular Crystals and Liquid Crystals

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“…Aryl-core/aryl-core electrostatic interactions [4][5][6] are sometimes modelled using molecule-centred 'net' quadrupoles [7] but a better general treatment is the dispersed quadrupole model in which each carbon in the p-system is treated as a positive charge with a half negative charge above and below the plane of the ring, as implemented in the XED modelling suite created by Vinter [4][5][6][8][9][10]. The molecule-molecule interaction is then calculated as the sum van der Waals and quadrupolar terms across many interacting sites (a complementary polytopic interaction -CPI) [11]. One such CPI mixture is that formed between HAT6, 2,3,6,7,10,11-hexakis(hexyloxy)triphenylene 1a and PDQ9, [12].…”

Section: Discussionmentioning

confidence: 99%

Designing Better Columnar Mesophases

Boden¹,

Bushby²,

Lozman³

2003

Molecular Crystals and Liquid Crystals

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The conductivity, photoconductivity and mesophase ranges of hexaalkoxytriphenylene (HAT)-based discotic liquid crystals are all increased by adding one equivalent of {hexakis(4-nonylphenyl)dipyrazino[2,3-f:2 0 3 0 -h]-quinoxalene} (PDQ9). For some triphenylene derivatives, addition of PDQ9 induces liquid crystal behaviour, for HAT-based homopolymers the alignment characteristics are improved and for some HAT-based block copolymers, addition of PDQ9 induces microphase separation. The bonding interaction between the HAT and PDQ components is described as a CPI (complementary polytopic interaction) and is best modelled as an atom by atom sum of van der Waals and multipolar terms. Although strong it does not detectably perturb the electronic structure of either component and there is no charge-transfer.

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“…Columnar phases based on alternating triphenylene and hexaphenyltriphenylene moieties have shown to be extremely stable [16]. The enhanced stability of the columns in the 1 : 1 mixture is, in general, reflected by the fact that the clearing temperature is higher than that of the two starting components.…”

Section: Fullerenes With Disksmentioning

confidence: 99%